I've charged my 1000XM3s with:

- MacBook charger (USB-C / USB-C)

- Samsung phone charger (USB-C / USB-A)

- MacBook Thunderbolt dock cable (USB-C / USB-C)

- Dell XPS 13 charger (USB-C to Power)

- Razer Blade Stealth 13 charger (USB-C to Power)

- Anker Powerbank (USB-C to USB-C)

and some others. They all worked.

And this list pretty much shows why USB-C is so amazing even if it might confuse some people on the edges. I don't need to lug around a bunch of proprietary chargers and cables.